Explanation:
Using a ruler is not ideal for measuring the volume of irregular objects like a random stone. This is because they do not have definite length, width and height dimensions like regular objects eg a block of wood. Measuring the volume of the displaced water (eg using a calibrated cylinder) will give you the volume of the object. Remember an object displaces its own volume of a liquid when fully immersed in the liquid - Archimedes' principle.
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